from machine import Pin,PWM

led = (PWM(Pin(16)),PWM(Pin(17)),PWM(Pin(18)),PWM(Pin(19)))
for i in led:
    i.freq(1000)

while True:
    line = input("insert brightness value:")
    if line.isdigit():
        out = int(line)/100*65535
        print(out)
        for i in led:
            i.duty_u16(int(out))